将igs文件导入LT出现以下问题: 7{<F6F^P
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*** Error (AITX_BLANKED_ENTS) *** s
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The input file did not contain any supported non blanked independant entities. 0QC*Z (
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Please check the documentation for a list of supported entities. aOYd"S}u
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请教各位是什么原因,如何解决?